Buttonhole-sewing machine



Navo lo, E LB. ALLEN I BUTTONHBLE SEWING Aclum` F11-eci Doc. 15, 1925 3 Shets-Sheet 1 BY v WITNESS s;l

INVENToR `ATroRNl-:Y

Patented Nov. l0, 1925.

UNITED STATES 'ArAT'ENT orifice.

' 'EDWARD B. ALLN, or NEwTowN, CONNECTICUT, 11s-SIGNOR' To T'HESINGER MANU- FACTURING COMPANY, or ELIZABETH, NEW JERSEY, A coaronATIoN or' NEW JERSEY.

nn'r'roNnonEsEw:i-Ne MACHINE.

Application led December 15,1923. Serial No. `680,833. I

ToVaZZ 'whom z't may concern: c

Be it known that I, EDWARD B. ALLEN, a citizen of the United States, residing at Newtown, in the county of Fairfield and State of Connecticut, havevinvented certain new and useful Improvements in Buttonhole-Sewing Machines, ofwhich the following is a specification, reference being had therein to the accompanying drawings. This invention relatesvto buttonhole sewing machines and lhas for an object to provide a machine for sewing va novel four- 4thread buttonhole, such as that disclosed in my Ac opending ,application` Serial No. 680,832, filed herewith. A further object of the invention is tov provide a two-needle buttonhole sewing machine having a rotary turret with means for keeping the needle threads from entangling or twisting Awith `one another. v

To the ends in view the invention is preferably embodied in. a bottonhole sewingV machine which, except as her ,inafter described, is constructed substantially in .accordance with the disclosure ofmy Patent No. 15,324, reissued' April 4, 1922,A and the patent to Allen & Faulkner, No. 1,372,473, of March 22, 1921. Such a machine has a travelling work-clamp and a rotary turret for the under thread mechanism; the upper threadl mechanism including a needlebar which is mounted to turn Iwith saidV turret in4 sewing around the eye-end of a buttonhole, According to thepresent invention the needle-bar of my prior machinel has been fitted with two closely spaced needles, each carrying'an upperthread. rlhe under thread mechanism includes two alternately acting threaded loopers from which loopjs of under thread are seized by, auxiliary loopers or loopdetainers, and held in position. for entry by the descending needles. Difficulty was experienced in leading thef two` upper threads to the needles and preventing entanglement and twisting of such threads with one another. This difficulty has been successfully overcome by providing the hollow needle-bar with separate passageways for the respective needle-threadsv and by disposing the upper entrance tel one of the passageways at a level above the entrance to the other passageway.

In the accompanying drawings, Fig. i 1

lneedle-throat 15 carried is a side elevation,- partly iii section, of a buttonhole sewing machine embodying the invention. Fig. 2 isafragmentary elevation of therotary turret'and stitch-forming i1istrumentalities of the machine. .Fig. dv

is a longitudinal section, in larger scale, of the needle-bar of the machine.v Figa/1 and 5 are, respectively, right andmleft side'el'ey vations of the rotary turret and yunder thread mechanism.V Fig. 6is a plan View' ofthe under-thread mechanism; Fig. ',7Vis

Y a perspective view of the loop-detaining elements of the under thread mechanism.v Fig. c 8 1s a similar view of the alternately acting threaded loopers with which` the loop-de tainers ofFig. 7 cooperateand Figs. 9k to 15, inclusive, are perspective views illustratingvariOus stages in a cycle of opera@v tions of the stitch-forming instrumentalities. In the preferred embodiment ofthe in-k vention, asl illustrated and described `in my said reissued Patent No.15,324, the frame of the machine is constructed Vwith the 1101-;v

low rectangular base l. including the bedplate 2 from which rises the standard 3 of the bracket-farm,f1A terminating in the hollow head f5, yThe bed f2, supports vthe'usual travelling` work-c`lamp 6 to which flo'ngi- 1 tudinal feeding andsidewise shifting movements are imparted by the usual connections with the feed-wheel 7 for 4spacing the overseaming stitches.l of. aI bu-ttonhole.' The main'shaft S isjjournaled withinfandlongif tudinally of the base ,land is gearedbythe f usual -1 to 2 speedmultiplying cennection'to the upper or rneedle-operating shaft In general construction and arrangement of parts they needle-actuating mechanism yof the present machine is substantially the samev ,as that disclosed in said .Allen & Faulkner patent; the tubular needle-b`ar10 being journaled as usualfor reciprocating and turning movements inthe head 5l and at its lower end carrying the yoke 11 and cross-pin 12 yon which slides thefjogging needle-block 13? carryingk ,two closely spaced needles lffwhich descend simultaneously through the aperture 14 Fig.' v8,.'in the u i by .the rotary turret 16. Y

The lower thread mechanism Yis'carried byv they rotary turret 16,' the tubularshank '17 of which is'journaled asusual inaverti- .oppositelygextending arms =to which are rigidly secured the -right and left-hand threaded loopers 22, 23. rlhe looper-carrier 21 is given rocking movements by means 0I" the link connection 24 with the usual vertically reciprocating sleeve 25 telescopically received within the turret shank` 17 and drivenby suitable mechanism: such as disclosed in said Allen & Faulkner patent.

Cooperating with the threaded loopers are the alternately acting loop-detainers 26, 27, which are ulcrumed on the cross-pin 28 carried by theA posts 29 on the turret 16. The loop-detainers are moved simultaneously in Vopposite directions by the usual link connections 30 to vthe cross-head' 31 carried by the` vertically reciprocating rod 32 extending downwardly within the sleeve 25. The loopdetainer mechanism is substantially the same as that disclosed in said Allen & Faulkner patent. In the present machine, however, the detainers 26, 27, each operate to seize a loop of under or looper thread from its'respective looper 22, 23 and hold such loop in position for entryby the needles 13.

To overcome twisting and excessive friction on the needle-threads, the tubular needle-bar 10 is'formed with separate passageways constituted preferably by the thread-tubes 33,34 Afitted within the needle- 4bar 10. As will be observed, one of the thread-tubes 34 extendsabove the upper end of the other thread-tube 33 and this provision assistsv materially'in" keeping the needle-threads effectively separated* vas the needle-bar turnsin sewing around the eyeend of the buttonhole and in resuming initial position after the sewing is completed. The needle-threads are preferably `led through separate tensionV devices 35, 36 and separate apertures in the post 37 thence under the auxiliary take-up bar 38 and down through the thread-tubes 33, 34 to the re- Y for'sewing' machines comprising,'in combispective needles `13. The auxiliary take-up 38 is preferably constructed substantially in accordance with the disclosure of my Patent No. 1,482,671, dated February 5, 1924; `the 'top ends oi the thread-tubes 33, 34, in the i withdraws land as the .needles rise, Fig. 8,V

present machine, dipping belowY the level of the cross-bar 38 at the end of thedownstroke of the needle-bar, thereby overcoming a tendency of the needle-threads to twist between the needle-bar vand the Vpost 37.

yIn the operation of the machine, Fig. '9, the needles 13 pass their respective loops through a loop V44 of 'an under thread held spread bythe detainer 27. The detainer their loops 39, 40 are seized by the looper 23 which projects a loop 41 of a second under looper 23 withdraws, leaving its loop 41 on 70 .the detainer 26, Fig. 12, which detainerholds the loop 41 in position for ventry by the needles 13 on their next descent, Fig.- 13.

As soonas the loop 41 is entered by the needles, the detainer 26 is withdrawn to 75 'shed such loop.l As the needles rise, Fig.

14, they throw out loops 42, 43, which are seized by the looper'22 carrying an'under thread, a loop 44 of which thread is thereby passed through the upper thread loops 42,

'43, Fig. 15.' The loop 44 is nextlseizedby the detainer 27 and presented tothe needles, 13, as shownf in'Fig.` 9. llhis completes a cycle ofoperations. v f v l Having thus set forth the nature of the invention, what l claim herein is 1'- i 1. Overseaming stitch-forming mechanism for sewing machines comprising, in combination,r upper-thread mechanism having a plurality of jogging needles fixed relatively to one another, and under-thread mechanism comprising a pair of'threaded loopers each of which seizes thread-loops from both of said needles.

2. Overseaming stitch-forming mechanism for sewing machines' comprising, in combination, upper-thread mechanism having a vplurality of needles fixed relatively to one another, and under-thread mechanism comprising a pair of threaded loopers each of' 100 which seizes thread-loops from both of said needles and a` pair of loop-detainersA cooperatingwith said threaded loopers and needles.

3. Overseaming stitch-forming.mechanism y for sewing machines comprising, in combination, upper-thread mechanism having a plurality of jogging needles fixed relatively to one another, and under-thread mechanism includinga pair ofoppositely directed and threaded loopers cooperating alternately with said needles. Y- 4. Overseaming stitch-forming mechanism machine having a hollow reciprocating and axially turning needle-bar provided with separate passageways for the respective needle-threads, said passageways having their entrances disposed at different elevations, a thread-guiding post having separate thread-eyes, and an auxiliary take-up bar adjacent said needle-bar, the upper ends of said passageways dippingbelow the level of said auxiliary take-up bar at the end of the 10 downstroke ofthe needle-bar.

In testimony whereof, I have signed my name to this specification.

'EDWARD B. ALLEN. 

